CN113504489A - Capacitance leakage current detection device based on tantalum capacitance leakage current detection and use process - Google Patents

Abstract

The capacitance leakage current detection device based on tantalum capacitance leakage current detection and the use process thereof, the capacitance charge-discharge module comprises a resistor R₁Resistance R₂Tantalum capacitor C₁Tantalum capacitor C₂Tantalum capacitor C₃Tantalum capacitor C₄Tantalum capacitor C₅Tantalum capacitor C₆Tantalum capacitor C₇Tantalum capacitor C₈And a switch S₁Switch S₂Switch S₃Switch S₄Switch S₅Switch S₆Switch S₇Switch S₈Switch S₉. Wherein the resistance R₂And S₁After being connected in series with R₁Parallel tantalum capacitor C₁To C₈And switch S₁To S₈Are respectively connected in parallel with the resistor R₁Are connected in series. R₁One end of the capacitor is connected with a +25V direct-current voltage source, and the other end of the capacitor is connected with 8 tantalum capacitors connected in parallel. In the charging state, all the switches are closed, and the current passes through the parallel resistor R₁，R₂To 8 electricityCharging at the same time, and disconnecting S after charging₁To S₈Then turn off S₉. Closing switch S₁Observing the LED in the Voltage comparison Module₁And an LED₂Judging whether the leakage current of the capacitor to be tested is qualified or not according to the brightness of the lamp, and then disconnecting S₁Closing S₂Observation LED₁And an LED₂Bright and dark conditions.

Description

Capacitance leakage current detection device based on tantalum capacitance leakage current detection and use process

Technical Field

The invention is applied to the field of detection of capacitor leakage current, and particularly relates to a capacitor leakage current detection device based on tantalum capacitor leakage current detection and a using process thereof. The defect that direct measurement by a voltmeter is inconvenient to carry is overcome, the reliability of detection is improved, simultaneous detection of multiple capacitors is realized, the detection flow is greatly simplified, and the detection efficiency is improved.

Background

With the rapid development of embedded integrated circuits, people put more and more functional requirements on the integrated circuits, and the performance of the capacitors can not be separated from the performance of the integrated circuits. Therefore, the functions of the integrated circuit become more and more, and the structure of the capacitor becomes more and more complicated. However, the problem also follows that the functional check of the capacitor leakage current is more and more complicated. The existing detection device is large in size, single in function, tedious and long in detection process and low in detection efficiency, and is only suitable for laboratory sample detection. Therefore, it becomes necessary to provide a new type of detecting device.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a capacitance leakage current detection device based on tantalum capacitance leakage current detection and a use process thereof, and solves the problems of complex detection equipment, complex detection process, long detection time and the like in the traditional use process.

The capacitance leakage current detection device based on tantalum capacitance leakage current detection comprises a capacitance charge-discharge module, a current-to-voltage module and a voltage comparison module, wherein the capacitance charge-discharge module comprises a resistor R₁Resistance R₂Tantalum capacitor C₁Tantalum capacitor C₂Tantalum capacitor C₃Tantalum capacitor C₄Tantalum capacitor C₅Tantalum capacitor C₆Tantalum capacitor C₇Tantalum capacitor C₈And a switch S₁Switch S₂Switch S₃Switch S₄Switch S₅Switch S₆Switch S₇Switch S₈Switch S₉Wherein the resistance R₂And switch S₁Connected in series with a resistor R₁Parallel tantalum capacitor C₁To tantalum capacitor C₈And switch S₁To S₈Are respectively connected in parallel with the resistor R₁Series connected, resistance R₁One end of the capacitor is connected with a +25V direct-current voltage source, and the other end of the capacitor is connected with 8 tantalum capacitors connected in parallel;

IN the capacitor charging and discharging module, two charging and discharging resistors are connected IN parallel and are connected IN series with eight capacitors connected IN parallel, meanwhile, a closed switch is connected on each capacitor branch, the other end of each resistor is connected with a +25V direct-current power supply, the other end of each capacitor is grounded, a current conversion voltage module adopts a MAX4173F integrated chip, a VCC interface of the current conversion voltage module is connected with a resistor R4 IN series and then is connected with a direct-current voltage source, GND is connected with the ground, an RS-end of the current conversion voltage module is connected between the direct-current voltage source and the resistor, an RS + end of the current conversion voltage module is connected with the other end of the resistor, a signal output end VOUT and a resistor R3 are connected IN series and then are connected with a forward input end IN2+ and a reverse input end IN 1-of a voltage comparison module, a voltage comparison module adopts an LM393 voltage comparator integrated chip, a power input end VCC of the voltage comparison module is connected with the direct-current voltage source, a forward input end IN2+ and a reverse input end IN 1-and a resistor R3 of the voltage comparison module are connected with a MAX71 7143F IN series and then are connected with a signal output end VOUT 3543F, the GND of the LM393 integrated chip is grounded, the signal output ends OUT1 and OUT2 of the LM393 integrated chip are connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is grounded.

Further, a +25V direct-current voltage source is used for supplying power to the charge-discharge module and the chip with the current conversion voltage MAX4173F, a +7.5V direct-current voltage source is used for supplying power to the voltage input end of the LM393, and IN₁+ is supplied using a +12.5V dc voltage source.

Further, the power input end of the MAX71 7142F integrated chip is connected with a resistor of 1K omega in series, so that the function of limiting the input current to protect the integrated chip is achieved.

Furthermore, the circuit adopts a two-way voltage comparator LM393 integrated chip, and when double power supplies are input, the voltage input range of a voltage input port is +/-1V to +/-18V.

The invention provides a use process of a capacitance leakage current detection device based on tantalum capacitance leakage current detection, which comprises the following specific steps:

step one, connecting a +25V direct-current voltage source into a resistor R₁、R₂、R₄One terminal of (1), +12.5V DC voltageSource access resistance R₅And +7.5V DC voltage source is connected into R₆And a pull-up resistor R is connected to₇、R₈Generates a pull-up voltage;

secondly, passing the current-voltage conversion module and the charge-discharge module through P₁、P₂Point connection;

thirdly, passing the current-to-voltage module and the voltage comparison module through P₃Point connection;

step four, all the switches are closed, the charging state is carried out, and the current passes through the parallel resistor R₁，R₂Charging 8 capacitors simultaneously, and disconnecting S after charging₁To S₈Then turn off S₉；

Step five, closing the switch S₁Into a capacitor C₁And (4) judging the magnitude of leakage current by judging the brightness of the two LED lamps in a lighting state, and if the leakage current is 0-1.5 mu A, judging the magnitude of the leakage current of the two LED lamps₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂Bright;

step six, the switch S is disconnected₁And an upper switch S₂Into a capacitor C₂And (4) judging the magnitude of leakage current by judging the brightness of the two LED lamps in the discharge state, wherein if the leakage current is 0-1.5 muA, the LED lamps₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂Bright;

step seven, repeating the step six, and respectively measuring C₃、C₄、C₅、C₆、C₇、C₈100 muf tantalum capacitor leakage current.

Compared with the prior art, the invention has the remarkable advantages that:

the problem of current verifying attachment volume great, carry inconvenient, inefficiency, function singleness, reliability low grade is solved, realized simultaneously that to leak current through closed, disconnect switch and detect, improved detection efficiency greatly for the electric capacity leaks current and detects convenient and fast more, can be used for detecting in batches. Provides a new method for industrial batch detection.

Drawings

Fig. 1 shows a capacitor charge-discharge module according to the present invention;

FIG. 2 is a current to voltage module of the present invention;

FIG. 3 is a voltage comparison module according to the present invention;

FIG. 4 is a circuit diagram of a capacitance leakage current detection device based on tantalum capacitance leakage current detection according to the present invention.

Detailed Description

For the purpose of promoting an understanding of the invention, reference will now be made in detail to the embodiments of the invention illustrated in the accompanying drawings.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

The solution of the invention is as follows: the device comprises a capacitance charging and discharging module, a current-voltage conversion module and a voltage comparison module. In the charging module, two charging and discharging resistors are connected in parallel and are connected in series with eight capacitors connected in parallel. Meanwhile, a closed switch is connected to each capacitor branch. The other end of the two resistors is connected with a +25V direct current power supply, and the other end of the capacitor is grounded. The current-to-voltage module adopts MAX4173F integrated chip, and V thereof_CCThe interface and the resistor R4 are connected in series and then are connected with a +25V direct-current voltage source, and GND is connected with the ground. The RS-end is connected between the DC voltage source and the resistor, the RS + end is connected with the other end of the resistor, and the signal output end V_OUTAnd a resistance R₃Forward input end IN of series-connected and voltage comparison module₂+ and inverting input IN₁-connected. The voltage comparison module adopts LM393 voltage ratioComparator IC having power supply input terminal V_CCIs connected with a direct voltage source of + 7.5V. Forward input end IN of voltage comparison module₂+ and inverting input IN₁-and a resistance R₃Is connected in series with the signal output end V of the MAX7143F_OUTAre connected. GND ground of LM393 integrated chip and its signal output terminal OUT₁、OUT₂The anode of the light emitting diode is connected with the cathode of the light emitting diode, and the cathode of the light emitting diode is grounded.

In the design, a +25V direct-current voltage source is used for supplying power to the charging and discharging module and the chip with the current conversion voltage MAX 4173F. The LM393 voltage input is powered using a +7.5V DC voltage source. IN₁+ is supplied using a +12.5V dc voltage source.

In the energized state, by closing switch S₉The two resistors are connected in parallel to reduce the total resistance and increase the current so as to achieve the purpose of rapidly charging the capacitor. By opening switch S in the discharge state₉The resistance in the loop is increased, so that the voltage at two ends of the resistance is increased, and the measurement result is more accurate.

And after all the capacitors are charged, the switches are disconnected, then one switch connected with the capacitors is independently closed, and the leakage current of each capacitor is independently measured. And after the test is finished, the just detected capacitor switch is switched off, and then the switch of the next capacitor is switched on to detect the leakage current of the capacitor. After which the previous operations are repeated. Therefore, the operation is convenient, and the leakage currents of a plurality of capacitors can be tested simultaneously.

The MAX7142F integrated chip has a 1K omega resistor connected in series with the power input end of the integrated chip, thereby playing a role in limiting the input current and protecting the integrated chip.

The circuit adopts a two-way voltage comparator LM393 integrated chip, and when double power supplies are input, the voltage input range of a voltage input port is +/-1V to +/-18V. The device adopts +7.5V direct current voltage to be connected to the voltage input end of the LM 393.

The signal output terminal of the MAX7143F chip is connected with the IN of the LM393 chip after being connected with a resistor IN series₁-and IN₂+ are connected. The range of the leakage current of the tantalum capacitor with 100 muF verified by the experiment is 0-1.5 muA, 1.5 muA-2.5 muA and 2.5 muA-infinity. The principle is as follows: the amplification power of the MAX7143F chip was 50,I_loadfor flowing R during discharging₁I.e. the output voltage VOUT is 50R₁＊I_load. This results in two input voltages of +12.5V and +7.5V for the two-way voltage comparator. IN₁+ series resistance R₅Rear connection +12.5V DC voltage source, IN₂-a series resistance R₆And then is connected with a +7.5V direct-current voltage source.

Voltage comparator LM393 signal output terminal OUT₁Connected to a light emitting diode and then grounded. When the output signal of AMX7143 is less than IN₁+ terminal voltage LED₁The lamp is illuminated and otherwise not illuminated. Voltage comparator LM393 signal output terminal OUT₂Connected to a light emitting diode and then grounded. When the output signal of AMX7143 is greater than IN₂-terminal voltage LED₂The lamp is illuminated and otherwise not illuminated.

Referring to fig. 1, the capacitance leakage current detection device based on tantalum capacitance leakage current detection according to the present invention includes a capacitance charging and discharging module, a current-to-voltage conversion module, and a voltage comparison module. The capacitor charging and discharging module comprises a resistor R₁Resistance R₂Tantalum capacitor C₁Tantalum capacitor C₂Tantalum capacitor C₃Tantalum capacitor C₄Tantalum capacitor C₅Tantalum capacitor C₆Tantalum capacitor C₇Tantalum capacitor C₈And a switch S₁Switch S₂Switch S₃Switch S₄Switch S₅Switch S₆Switch S₇Switch S₈Switch S₉. Wherein the resistance R₂And S₁After being connected in series with R₁Parallel tantalum capacitor C₁To C₈And switch S₁To S₈Are respectively connected in parallel with the resistor R₁Are connected in series. R₁One end of the capacitor is connected with a +25V direct-current voltage source, and the other end of the capacitor is connected with 8 tantalum capacitors connected in parallel. In the charging state, all the switches are closed, and the current passes through the parallel resistor R₁，R₂Charging 8 capacitors simultaneously, and disconnecting S after charging₁To S₈Then turn off S₉. Closing switch S₁Observing the LED in the Voltage comparison Module₁And an LED₂Of lampsJudging whether the leakage current of the capacitor to be tested is qualified or not under the bright and dark conditions, and then disconnecting S₁Closing S₂Observation LED₁And an LED₂The light and dark conditions of (1) and so on.

With reference to fig. 2 and fig. 3, the conversion of the current signal into the voltage signal through the MAX7143F chip and the output of the voltage signal to the voltage comparison module are realized through the connection of the points P1 and P2. The voltage signal converted by the MAX7143F chip is output to the voltage comparison module LM393 chip through the connection of P3. And the comparator in the middle LM393 chip of the voltage comparison module compares the ratio of the output voltage to the two high and low voltages to judge whether the value of the leakage current is qualified.

FIG. 4 is a schematic diagram of a capacitance leakage current detection device based on tantalum capacitance leakage current detection. Whether the leakage current of the capacitor is qualified or not can be judged according to the brightness of the two LED lamps at the tail end of the circuit.

The capacitance leakage current detection device based on tantalum capacitance leakage current detection has the following use process:

step one, connecting a +25V direct-current voltage source into a resistor R₁、R₂、R₄To one end of (a). +12.5V DC voltage source access resistor R₅And +7.5V DC voltage source is connected into R₆And a pull-up resistor R is connected to₇、R₈Generates a pull-up voltage.

Secondly, passing the current-voltage conversion module and the charge-discharge module through P₁、P₂And (4) point connection.

Thirdly, passing the current-to-voltage module and the voltage comparison module through P₃And (4) point connection.

Step four, all the switches are closed, the charging state is carried out, and the current passes through the parallel resistor R₁，R₂Charging 8 capacitors simultaneously, and disconnecting S after charging₁To S₈Then turn off S₉。

Step five, closing the switch S₁Into a capacitor C₁And (4) judging the leakage current of the two LED lamps by judging the brightness of the two LED lamps in the lighting state. If the leakage current is 0-1.5 muA, the LED₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂And (4) bright.

Step six, the switch S is disconnected₁And an upper switch S₂Into a capacitor C₂And the discharge state is judged, and the magnitude of leakage current of the two LED lamps is judged by judging the brightness of the two LED lamps. If the leakage current is 0-1.5 muA, the LED₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂And (4) bright.

Step seven, repeating the step six, and respectively measuring C₃、C₄、C₅、C₆、C₇、C₈100 muf tantalum capacitor leakage current.

The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and also comprise the technical scheme formed by equivalent replacement of the technical features. The present invention is not limited to the details given herein, but is within the ordinary knowledge of those skilled in the art.

Claims (5)

1. Capacitance leakage current detection device based on tantalum capacitance leakage current detection, including electric capacity charge-discharge module, electric current commentaries on classics voltage module and voltage comparison module, its characterized in that: the capacitor charging and discharging module comprises a resistor R₁Resistance R₂Tantalum capacitor C₁Tantalum capacitor C₂Tantalum capacitor C₃Tantalum capacitor C₄Tantalum capacitor C₅Tantalum capacitor C₆Tantalum capacitor C₇Tantalum capacitor C₈And a switch S₁Switch S₂Switch S₃Switch S₄Switch S₅Switch S₆Switch S₇Switch S₈Switch S₉Wherein the resistance R₂And switch S₁Connected in series with a resistor R₁Parallel tantalum capacitor C₁To tantalum capacitor C₈And switch S₁To S₈Are respectively connected in parallel with the resistor R₁Series connected with a resistorR₁One end of the capacitor is connected with a +25V direct-current voltage source, and the other end of the capacitor is connected with 8 tantalum capacitors connected in parallel;

IN the capacitor charging and discharging module, two charging and discharging resistors are connected IN parallel and are connected IN series with eight capacitors connected IN parallel, meanwhile, a closed switch is connected on each capacitor branch, the other end of each resistor is connected with a +25V direct-current power supply, the other end of each capacitor is grounded, a current conversion voltage module adopts a MAX4173F integrated chip, a VCC interface of the current conversion voltage module is connected with a resistor R4 IN series and then is connected with a direct-current voltage source, GND is connected with the ground, an RS-end of the current conversion voltage module is connected between the direct-current voltage source and the resistor, an RS + end of the current conversion voltage module is connected with the other end of the resistor, a signal output end VOUT and a resistor R3 are connected IN series and then are connected with a forward input end IN2+ and a reverse input end IN 1-of a voltage comparison module, a voltage comparison module adopts an LM393 voltage comparator integrated chip, a power input end VCC of the voltage comparison module is connected with the direct-current voltage source, a forward input end IN2+ and a reverse input end IN 1-and a resistor R3 of the voltage comparison module are connected with a MAX71 7143F IN series and then are connected with a signal output end VOUT 3543F, the GND of the LM393 integrated chip is grounded, the signal output ends OUT1 and OUT2 of the LM393 integrated chip are connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is grounded.

2. The device of claim 1, wherein: a +25V direct-current voltage source is used for supplying power to the charge-discharge module and the chip with the current conversion voltage MAX4173F, a +7.5V direct-current voltage source is used for supplying power to the voltage input end of the LM393, and the IN voltage source is used for supplying power to the voltage input end of the LM393₁+ is supplied using a +12.5V dc voltage source.

3. The device of claim 1, wherein: the MAX7142F integrated chip is provided with a resistor of 1K omega connected in series with the power supply input end.

4. The device of claim 1, wherein: the circuit adopts a two-way voltage comparator LM393 integrated chip, and when double power supplies are input, the voltage input range of a voltage input port is +/-1V to +/-18V.

5. The use process of the capacitance leakage current detection device based on tantalum capacitance leakage current detection according to any one of claims 1-4, comprises the following specific steps:

step one, connecting a +25V direct-current voltage source into a resistor R₁、R₂、R₄One end of the resistor R is connected with a +12.5V direct-current voltage source access resistor R₅And +7.5V DC voltage source is connected into R₆And a pull-up resistor R is connected to₇、R₈Generates a pull-up voltage;

secondly, passing the current-voltage conversion module and the charge-discharge module through P₁、P₂Point connection;

thirdly, passing the current-to-voltage module and the voltage comparison module through P₃Point connection;

step four, all the switches are closed, the charging state is carried out, and the current passes through the parallel resistor R₁，R₂Charging 8 capacitors simultaneously, and disconnecting S after charging₁To S₈Then turn off S₉；

Step five, closing the switch S₁Into a capacitor C₁And (4) judging the magnitude of leakage current by judging the brightness of the two LED lamps in a lighting state, and if the leakage current is 0-1.5 mu A, judging the magnitude of the leakage current of the two LED lamps₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂Bright;

step six, the switch S is disconnected₁And an upper switch S₂Into a capacitor C₂And (4) judging the magnitude of leakage current by judging the brightness of the two LED lamps in the discharge state, wherein if the leakage current is 0-1.5 muA, the LED lamps₁Bright, LED₂When the LED is off, if the leakage current is between 1.5 muA and 2.5 muA, the LED is turned off₁And an LED₂Meanwhile, if the leakage current is between 2.5 muA and infinity, the LED is on₁Extinguishing LED₂Bright;

step seven, repeating the step six, and respectively measuring C₃、C₄、C₅、C₆、C₇、C₈100 muf tantalum capacitor leakage current.

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